CN216015506U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application discloses battery monomer, battery and power consumption device. The battery cell includes: the method comprises the following steps: a housing; an electrode assembly disposed within the case; the separator is sleeved between the shell and the electrode assembly and used for separating the shell and the electrode assembly; and the friction enhancement layer is arranged between the shell and the separator and between the separator and the electrode assembly, wherein the friction enhancement layer is configured to increase the friction force when the shell, the separator and the electrode assembly move relatively. The single battery can prolong the service life of the battery and enhance the safety of the battery by arranging the friction enhancement layer between the shell and the separator and between the separator and the electrode assembly.

Description

Battery cell, battery and power consumption device

Technical Field

The application relates to the field of batteries, in particular to a battery monomer, a battery and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

In addition to improving the performance of batteries, service life and safety issues are also considerable issues in the development of battery technology. If the battery life does not reach the expected time, the maintenance and use costs of the battery are significant. If the safety problem of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to prolong the service life of the battery and enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery cell, a battery and an electric device to prolong the service life of the battery and enhance the safety of the battery.

In a first aspect, a battery cell is provided, including: a housing; an electrode assembly disposed within the case; the separator is sleeved between the shell and the electrode assembly and used for separating the shell and the electrode assembly; and the friction enhancement layer is arranged between the shell and the separator and between the separator and the electrode assembly, wherein the friction enhancement layer is configured to increase the friction force when the shell, the separator and the electrode assembly move relatively.

In this embodiment, the single battery of this application can increase the frictional force between casing, separator and the electrode subassembly three simultaneously through setting up the friction enhancement layer, and each interface between the three all can have sufficient frictional force in order to overcome relative motion between the three to avoided effectively among the prior art because of the single battery inefficacy scheduling problem that instantaneous high-speed impact caused, and then can prolong the free life of battery and the security when using effectively.

In some embodiments, the spacer comprises: and the annular side wall is attached to and sleeved between the outer peripheral wall surface of the electrode assembly and the inner peripheral wall surface of the shell. The friction enhancement layer is arranged between the inner peripheral wall surface of the shell and the annular side wall and between the annular side wall and the outer peripheral wall surface of the electrode assembly.

In this embodiment, the friction enhancement layer is provided between the inner peripheral wall surface of the case and the annular side wall and between the annular side wall and the outer peripheral wall surface of the electrode assembly, so that the frictional force in the X-axis and Z-axis directions of the three can be increased, and the relative movement in the X-axis and Z-axis directions of the three can be effectively reduced.

In some embodiments, the spacer further comprises: a bottom wall sealed at the bottom opening of the annular side wall and used for being attached and connected between the bottom surface of the electrode assembly and the inner bottom surface of the shell; the friction enhancing layer is also disposed between the bottom surface of the electrode assembly and the bottom wall, and/or the friction enhancing layer is disposed between the bottom wall and the inner bottom surface of the case.

In this embodiment, the friction enhancing layer is provided to further increase the friction force in the Y-axis direction of the case, the separator, and the electrode assembly, thereby further preventing the relative movement of the case, the separator, and the electrode assembly. In addition, the friction enhancement layer is arranged between the interfaces of the electrode assembly and the separator, so that when the separator deforms in a high-temperature environment, adhesion with the electrode assembly can be formed to a certain degree, and the shrinkage of the separator can be inhibited to a certain degree. Under the same high temperature environment, the contraction critical point of the extension separator can effectively prolong the failure time of the separator under the high temperature environment, thereby further improving the thermal safety of the battery monomer and prolonging the service life of the battery monomer.

In some embodiments, the electrode assembly is provided in plurality, the plurality of electrode assemblies are juxtaposed within the case, and the friction enhancing layer is also provided between adjacent electrode assemblies.

In this embodiment, the friction between the adjacent electrode assemblies is further increased by providing the friction enhancing layer between the adjacent electrode assemblies, so that the relative movement between the adjacent electrode assemblies can be further reduced.

In some embodiments, the friction enhancing layer is configured as a gel layer.

In the embodiment, the friction enhancement layer can be fixed in a direct bonding mode, and the fixing mode is more convenient.

In some embodiments, the colloidal layer is configured to be formed by printing on: the shell is attached to at least one of the two surfaces of the isolating piece; and a separator attached to at least one of two surfaces of the electrode assembly.

In this embodiment, on one hand, the double-sided printing of the colloid layer can further improve the friction force between the interfaces; on the other hand, the number of components can be reduced by printing.

In some embodiments, the material of the colloidal layer is at least one of polyurethane, epoxy resin, polyacrylic resin, phenolic resin, polyvinyl chloride resin, polyvinylidene fluoride.

In this embodiment, the colloidal layer using the above materials can have better stability, chemical resistance, resilience, and mechanical properties, while having less compression set.

In some embodiments, the friction enhancing layer is configured as a relief layer or etch layer configured to be formed by laser light at: the shell is attached to at least one of the two surfaces of the isolating piece; and a separator attached to at least one of two surfaces of the electrode assembly.

In the embodiment, on one hand, the friction force between interfaces can be further improved through laser recessing and etching on the two sides; on the other hand, the processing and forming modes of the friction enhancement layer are diversified, and the setting is more flexible.

In a second aspect, a battery is provided, which includes the battery cell.

In a third aspect, an electric device is provided, which comprises the above battery, and the battery is used for providing electric energy.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural view of the electrode assembly shown in FIG. 3;

FIG. 5 is a bottom structural view of the electrode assembly shown in FIG. 4;

FIG. 6 is a schematic view of the spacer shown in FIG. 3;

fig. 7 is a schematic structural view of the housing shown in fig. 3.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The applicant has noted that the lower limit of initial pretension of a battery cell (e.g. a lithium ion battery cell) in a fitting housing is 1000N. However, the pretightening force of the newly produced battery monomer is greatly lower than the pretightening force under low temperature and low SOC (State of Charge), because under low SOC, lithium ions return to the anode, the cathode becomes thin, and the electrode assembly becomes thin; at low temperatures, the shrinkage of the electrode assembly is much greater than that of the case, which puts high demands on the friction coefficient between the interfaces within the battery cell.

In the prior art, the electrode assembly is subjected to a large shock acceleration after the vehicle is subjected to a severe rigid impact. The electrode assembly has high quality, and after full charge, the negative pole piece expands because lithium ions are embedded into the negative pole, the binder is in a tight state, and the negative pole becomes brittle at the moment. Under instantaneous high-speed impact, the electrode assembly collides with the surface of the shell, so that the pole piece is easy to break, and burrs of the pole piece pierce through the diaphragm, so that the battery monomer loses efficacy instantly. In addition, the vehicle can experience various vibrations in the driving process, even fall, and the electrode assembly still can injure the lower plastic extrusion part pole piece under extreme circumstances, leads to the production of burr, further endangers the monomer safety of battery.

Based on the above consideration, in order to solve the problem that the service life and safety of the battery cell are reduced due to vibration during the use of the battery cell, through intensive research, the applicant designs a battery cell, and by increasing the friction between the case and the separator and between the separator and the electrode assembly, the relative movement of the electrode assembly, the separator and the case can be reduced during the vibration of the battery cell, so as to avoid the above problem.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. Referring to fig. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, and other functional components (e.g., a separator 24).

The end cap 21 refers to a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved safety. The end cap 21 may be provided with functional components such as the electrode terminals 21 a. The electrode terminals 21a may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric energy of the battery cells 20. In some embodiments, the end cap 21 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is an assembly for mating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 may be separate components, and an opening may be formed in the housing 22, and the opening may be covered by the end cap 21 to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 may be integrated, and specifically, the end cap 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 22, the end cap 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portion of the electrode assembly 23, and the portions of the positive and negative electrode tabs having no active material each constitute a tab 23 a. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery, the positive and negative active materials react with the electrolyte, and the tab 23a is connected to the electrode terminal 21a to form a current loop.

Some embodiments of a battery cell 20 according to the present invention. Referring to fig. 3 to 7, a battery cell 20 of the present application includes: a housing 22; an electrode assembly 23 disposed in the case 22; a separator 24 interposed between the case 22 and the electrode assembly 23 for separating the case 22 and the electrode assembly 23; and a friction enhancing layer 25 provided between the case 22 and the separator 24 and between the separator 24 and the electrode assembly 23. Wherein the friction enhancing layer 25 is configured to increase a friction force when the case 22, the separator 24 and the electrode assembly 23 move relatively.

The separator 24 mentioned in the present application may be understood as an insulating film for separating the case 22 and the electrode assembly 23. The friction enhancing layer 25 mentioned in the present application should be understood as a component capable of increasing the friction force when the casing 22, the separator 24 and the electrode assembly 23 move relatively, and specifically, the friction enhancing layer 25 can improve the roughness of the interface where the casing 22, the separator 24 and the electrode assembly 23 are attached to each other. The friction enhancing layer 25 mentioned in the present application may be a separate component, or may be formed on the surfaces of the case 22, the separator 24, and the electrode assembly 23. The friction force referred to in this application means that when the three components, i.e., the case 22, the separator 24 and the electrode assembly 23, are brought into contact with each other and pressed after being assembled, and when the three components move relatively or have a tendency to move relatively, a force resisting the relative movement or the tendency to move relatively is generated on the contact surface by the friction enhancing layer 25. The area and location of the friction enhancing layer 25 referred to herein may be configured and defined in conjunction with the impact resistance requirements of the particular battery cell 20.

After the battery cell 20 according to the embodiment of the present invention sequentially assembles the case 22, the separator 24, and the electrode assembly 23, friction enhancing layers 25 are simultaneously disposed between the case 22 and the separator 24 and between the separator 24 and the electrode assembly 23. The case 22, the separator 24, and the electrode assembly 23 undergo large relative movements under instantaneous high-speed impacts of the battery cell 20. This application is through setting up friction enhancement layer 25, can increase the frictional force between casing 22, separator 24 and the electrode subassembly 23 three simultaneously, and each interface between the three all can have sufficient frictional force in order to overcome the relative motion between the three to avoided effectively among the prior art because of the instantaneous high-speed battery monomer 20 inefficacy scheduling problem that causes of strikeing, and then the security when can prolong battery monomer 20's life and use effectively.

In some embodiments, as shown with reference to fig. 3 and 6, the spacer 24 may include: and an annular side wall 241 for attaching and fitting between the outer circumferential wall surface of the electrode assembly 23 and the inner circumferential wall surface of the case 22. Among them, the friction enhancing layer 25 is provided between the inner peripheral wall surface of the case 22 and the annular side wall 241 and between the annular side wall 241 and the outer peripheral wall surface of the electrode assembly 23.

The annular sidewall 241 referred to in the present application should be understood as a sidewall surface of the separator 24 surrounding the outer circumference of the electrode assembly 23, which is configured in an annular shape, and is disposed between the electrode assembly 23 and the case 22. In the present application, the friction enhancing layer 25 is provided between the inner peripheral wall surface of the case 22 and the annular side wall 241 and between the annular side wall 241 and the outer peripheral wall surface of the electrode assembly 23, so that the friction enhancing layer 25 is provided at the positions of the three side walls. It should be noted that the X-axis and the Z-axis may be defined as the directions shown in fig. 3.

In some embodiments, as shown with reference to fig. 3, 5, and 6, the spacer 24 may further include: a bottom wall sealed to the bottom opening of the annular sidewall 241 for attachment between the bottom surface of the electrode assembly 23 and the inner bottom surface of the case 22; the friction enhancing layer 25 is also disposed between the bottom surface and the bottom wall of the electrode assembly 23, and/or the friction enhancing layer 25 is disposed between the bottom wall and the inner bottom surface of the case 22.

In the present application, the bottom wall is sealed to the bottom opening of the annular sidewall 241 and can be sleeved on the side and bottom surfaces of the outer periphery of the electrode assembly 23. In the present application, by providing the friction enhancing layer 25 between the bottom surface and the bottom wall of the electrode assembly 23 and/or between the bottom wall and the inner bottom surface of the case 22 where the friction enhancing layer 25 is provided, in combination with the above description, while the friction force in the directions along the X axis and the Z axis of the three (the case 22, the separator 24, and the electrode assembly 23) is improved, the friction force in the direction along the Y axis of the case 22, the separator 24, and the electrode assembly 23 can be improved by the provision of the friction enhancing layer 25, so that the relative movement of the three of the case 22, the separator 24, and the electrode assembly 23 can be further avoided.

Further, the friction enhancing layer 25 is disposed between the bottom surface and the bottom wall of the electrode assembly 23, and can play a role of tightening the separator 24 while increasing the frictional force between the interface of the electrode assembly 23 and the separator 24. Specifically, the separator 24 is generally obtained by stretching a PE (polyethylene) film, and the separator 24 is shrunk at a high temperature. In the present application, by providing the friction enhancing layer 25 between the electrode assembly 23 and the separator 24, when the separator 24 deforms in a high temperature environment, adhesion with the electrode assembly 23 can be formed to some extent, so that shrinkage of the separator 24 can be suppressed to some extent. Through this setting, under equal high temperature environment, the shrink critical point of extension separator 24 can prolong the dead time of separator 24 under high temperature environment effectively to can further promote battery monomer 20's thermal safety, prolong battery monomer 20's life.

In some embodiments, as shown with reference to fig. 3 to 5, the electrode assembly 23 may be provided in plurality, a plurality of electrode assemblies 23 are juxtaposed in the case 22, and the friction enhancing layer 25 is further provided between the adjacent electrode assemblies 23. The electrode assembly 23 mentioned in the present application is provided in plurality, which generally means that more than two electrode assemblies 23 are generally provided in the battery cell 20. In this embodiment, the friction between the adjacent electrode assemblies 23 is further increased by providing the friction enhancing layer 25 between the adjacent electrode assemblies 23, so that the relative movement between the adjacent electrode assemblies 23 can be further reduced.

In some embodiments, the friction enhancing layer 25 may be configured as a gel layer. The colloidal layer referred to in this application is understood to be a gummed paper-like component having a somewhat rough surface. Through this setting, the form that the accessible directly bonds is fixed, and fixed mode is more convenient.

In some embodiments, the colloidal layer may be configured to be formed by printing on: at least one of the two surfaces of the housing 22 that abut the spacer 24; and, the separator 24 is attached to at least one of the two faces of the electrode assembly 23. Alternatively, the colloid layer may be printed simultaneously on both sides of the case 22, which are attached to the separator 24, and on both sides of the separator 24, which are attached to the electrode assembly 23. By printing the colloidal layer on both sides, the frictional force between the interfaces can be further increased. Further, the number of parts can be reduced by printing so that the case 22, the separator 24, and the electrode assembly 23 are assembled in a conventional assembly manner.

In some embodiments, the material of the colloidal layer may be at least one of polyurethane, epoxy, polyacrylic, phenolic, polyvinyl chloride, polyvinylidene fluoride. In the application, the colloid layer made of the material has better stability, chemical resistance, rebound resilience and mechanical property, and has smaller compression deformability.

In some embodiments, the friction enhancing layer 25 may be configured as a relief layer or etch layer configured to be formed by laser light from: at least one of the two surfaces of the housing 22 that abut the spacer 24; and, the separator 24 is attached to at least one of the two faces of the electrode assembly 23. Alternatively, the concavo-convex layer or the etching layer may be formed by laser at the same time on both sides of the case 22 attached to the separator 24 and on both sides of the separator 24 attached to the electrode assembly 23. On one hand, the friction force between interfaces can be further improved through laser dishing and etching on the two sides; on the other hand, the friction enhancing layer 25 is formed in various ways and is more flexible.

According to some embodiments of the present application, referring to fig. 2, a battery 100 is provided, including any of the battery cells 20 described above.

According to some embodiments of the present application, referring to fig. 1, there is provided an electric device (e.g., a vehicle 1000) including any of the above-described batteries 100, the batteries 100 being configured to provide electric energy. In this application, the powered device may be any one of the aforementioned apparatuses or systems using the battery 100.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (10)

1. A battery cell, comprising:

a housing;

an electrode assembly disposed within the housing;

the separator is sleeved between the shell and the electrode assembly and used for separating the shell and the electrode assembly;

and a friction enhancing layer disposed between the case and the separator and between the separator and the electrode assembly, wherein the friction enhancing layer is configured to increase a friction force when the case, the separator, and the electrode assembly move relatively.

2. The battery cell of claim 1, wherein the separator comprises:

an annular side wall for attaching and sleeving between an outer peripheral wall surface of the electrode assembly and an inner peripheral wall surface of the case;

wherein the friction enhancing layer is provided between the inner peripheral wall surface of the case and the annular side wall and between the annular side wall and the outer peripheral wall surface of the electrode assembly.

3. The battery cell of claim 2, wherein the separator further comprises:

the bottom wall is sealed at the bottom opening of the annular side wall and is used for being attached and connected between the bottom surface of the electrode assembly and the inner bottom surface of the shell;

The friction enhancing layer is further disposed between the bottom surface of the electrode assembly and the bottom wall, and/or the friction enhancing layer is disposed between the bottom wall and the inner bottom surface of the case.

4. The battery cell of claim 3, wherein the electrode assembly is provided in plurality, the electrode assemblies are juxtaposed in the case, and the friction enhancing layer is further provided between adjacent electrode assemblies.

5. The battery cell of any of claims 1-4, wherein the friction enhancing layer is configured as a gel layer.

6. The battery cell of claim 5, wherein the gel layer is configured to be formed by printing on: the shell is attached to at least one of the two surfaces of the isolating piece; and, the separator is attached to at least one of two surfaces of the electrode assembly.

7. The battery cell of claim 5, wherein the gel layer is made of at least one of polyurethane, epoxy resin, polyacrylic resin, phenolic resin, polyvinyl chloride resin, and polyvinylidene fluoride.

8. The battery cell according to any of claims 1-4, wherein the friction enhancing layer is configured as a relief layer or etch layer configured to be formed by laser light from: the shell is attached to at least one of the two surfaces of the isolating piece; and, the separator is attached to at least one of two surfaces of the electrode assembly.

9. A battery comprising the battery cell of any one of claims 1 to 8.

10. An electrical device comprising a battery according to claim 9 for providing electrical energy.

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